/*
* Copyright (c) 2002-2009 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.shell.kernel.apps;
import org.neo4j.shell.AppCommandParser;
import org.neo4j.shell.OptionValueType;
import org.neo4j.shell.Output;
import org.neo4j.shell.Session;
import org.neo4j.shell.ShellException;
/**
* Mimics the POSIX application with the same name, i.e. renames a property. It
* could also (regarding POSIX) move nodes, but it doesn't).
*/
public class Mv extends GraphDatabaseApp
{
/**
* Constructs a new "mv" application.
*/
public Mv()
{
super();
this.addValueType( "o", new OptionContext( OptionValueType.NONE,
"To override if the key already exists" ) );
}
@Override
public String getDescription()
{
return "Renames a property on a node or relationship. " +
"Usage: mv <key> <new-key>";
}
@Override
protected String exec( AppCommandParser parser, Session session, Output out )
throws ShellException
{
if ( parser.arguments().size() < 2 )
{
throw new ShellException( "Must supply <from-key> <to-key> " +
"arguments, like: mv name \"given_name\"" );
}
String fromKey = parser.arguments().get( 0 );
String toKey = parser.arguments().get( 1 );
boolean mayOverwrite = parser.options().containsKey( "o" );
NodeOrRelationship thing = getCurrent( session );
if ( !thing.hasProperty( fromKey ) )
{
throw new ShellException( "Property '" + fromKey +
"' doesn't exist" );
}
if ( thing.hasProperty( toKey ) )
{
if ( !mayOverwrite )
{
throw new ShellException( "Property '" + toKey +
"' already exists, supply -o flag to overwrite" );
}
else
{
thing.removeProperty( toKey );
}
}
Object value = thing.removeProperty( fromKey );
thing.setProperty( toKey, value );
return null;
}
}